Progress payments based on a percentage or stage of completion are authorized for use as a payment method under EPA contracts or subcontracts for construction and alteration or repair of buildings, structures, or other real property.

The Contracting Officer shall insert the clause at 1552.232-73, Payments - Fixed Rate Services Contract, in solicitations and indefinite delivery/indefinite quantity contracts when services are being acquired on a fixed-rate basis.

(a) EPA Form 1900-10 Contractor's Cumulative Claim and Reconciliation, at 1553.232-74, shall be used for an accounting of the cumulative charges and costs for cost-reimbursement contracts from inception of the contract to completion. It shall be submitted by the Contractor upon submission of the completion voucher.

(b) EPA Form 1900-68, Notice of Contract Costs Suspended and/or Disallowed, at 1553.232-75, shall be inserted in all cost-reimbursement type and fixed-rate type contracts.